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This is a reland of c670ba45

Original change's description:
> Reland "Turn on Media History by default"
>
> This is a reland of ccf0e2f9
>
> Fixes TSAN issue in the constructor of sql::Database
> by moving it to the main thread.
>
> Original change's description:
> > Turn on Media History by default
> >
> > BUG=1024351
> >
> > Change-Id: Id01595e63f5f776a226087741ef602ba30b80328
> > Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/2295224
> > Auto-Submit: Becca Hughes <beccahughes@chromium.org>
> > Commit-Queue: Tommy Steimel <steimel@chromium.org>
> > Reviewed-by: Tommy Steimel <steimel@chromium.org>
> > Cr-Commit-Position: refs/heads/master@{#787954}
>
> Bug: 1024351
> Change-Id: I19be665637f5c28261f7197547ddc5fe6671127e
> Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/2296884
> Reviewed-by: Tommy Steimel <steimel@chromium.org>
> Commit-Queue: Becca Hughes <beccahughes@chromium.org>
> Cr-Commit-Position: refs/heads/master@{#788312}

Bug: 1024351
Change-Id: Ie371d56df987c19a10017050ead02922a530f2ed
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/2300224Reviewed-by: Tommy Steimel <steimel@chromium.org>
Commit-Queue: Becca Hughes <beccahughes@chromium.org>
Cr-Commit-Position: refs/heads/master@{#788721}